Audi Workshop Service and Repair Manuals

Checking fuel pump delivery rate - vehicles with 8-cylinder FSI engine (RS 5) Special tools and workshop equipment required

t  K-Jetronic pressure tester -V.A.G 1318-

t  Adapter -V.A.G 1318/11-

t  Adapter set -V.A.G 1318/17A-

t  Connector -V.A.G 1318/23-

t  Remote control -V.A.G 1348/3A- for V.A.G 1348 with adapter cable -V.A.G 1348/3-3-

t  Auxiliary measuring set -V.A.G 1594C- t  Fuel-resistant measuring container

Procedure –  Observe test conditions → Chapter. –  Remove rear seat bench → Rep. gr.72. –  Unscrew cover for flange -arrows-.

–  Unplug electrical connector -1- on flange.   Note Disregard -item 2-.

–  Lift cover -1- by its handle -arrow-.

–  Connect remote control -V.A.G 1348/3A- for V.A.G 1348 to contact -1- using adapter cable -V.A.G 1348/3-3- and test lead from auxiliary measuring set -V.A.G 1594C-. –  Tape off 2nd connector contact of adapter cable -V.A.G 1348/3-3- with insulating tape -arrow- to prevent short circuits. –  Connect contact -5- to vehicle body (earth) using a test lead from auxiliary measuring set -V.A.G 1594C-. –  Move switch of remote control -V.A.G 1348/3A- for V.A.G 1348 to front of engine compartment.

–  Release retainer -arrow A- and open cover -arrow B-.

–  Connect crocodile clip to jump start socket -U6--item A- in terminal 30 wiring junction 2 -TV22- located in plenum chamber. –  Remove filler cap from fuel filler neck.

–  Remove engine cover panel -arrows-.

WARNING Risk of injury - fuel system operates under high pressure. To reduce the pressure in the fuel system, wrap a clean cloth around the connection and carefully loosen the connection. –  Push down protective sleeve -1- and disconnect fuel line. –  First press hose connector -2- downwards -arrow A-, then press release tabs -arrow B-. –  Pull off hose connector, keeping release tabs depressed.

–  Screw connector -V.A.G 1318/23- and adapter -V.A.G 1318/17-1A- onto K-Jetronic pressure tester -V.A.G 1318-. –  Fit -V.A.G 1318/17-1A- onto disconnected fuel line. –  Connect adapter -V.A.G 1318/11- to -V.A.G 1318-. –  Attach test hose -arrow- and hold end of hose in measuring container. –  Open cut-off valve on pressure tester. l  Lever must point in direction of flow. –  Build up pressure in fuel system by pressing remote control switch and slowly closing cut-off valve on pressure tester. l  Specification: 4 bar –  From this point on do not move position of cut-off valve. –  Drain measuring container.

–  Press remote control switch for 15 seconds. –  Compare amount of fuel delivered with minimum delivery shown in diagram (cm3/15 sec.).   Note Voltage at fuel pump with engine stationary and pump running is approx. 2 volts less than battery voltage. If minimum delivery rate is not achieved, check for the following causes: t  Fuel lines have been crushed. t  Fuel filter is blocked. t  Fuel pump is defective. Installation is carried out in the reverse order; note the following: –  Connect fuel line to fuel rail → Rep. gr.24. –  Install cover for flange → Fig.. –  Install rear seat bench → Rep. gr.72.